ABSTRACT
Variable-speed drives are required for variable output processes in order to increase productivity and for energy savings. Pumps, ventilators, refrigerator compressors, and so on can all benefit from variable speed. PMSMs with high-energy magnets have been proposed recently to replace some induction motor variable-speed drives for the scope in order to increase the power factor and efficiency. However, the high price of high-energy PMs puts this solution in question, especially for initial cost constraint applications.
